We already have a MathML feature on the repo: https://github.com/web-platform-dx/web-features/blob/main/features/mathml.yml which contains quite a lot of BCD keys.

Looking at the list of remaining unmapped BCD keys, I see there are quite a few still. These are marked as deprecated on BCD.

How do we want to handle them on this repo?

• maction - Entire element is deprecated

  • mathml.elements.maction
  • mathml.elements.maction.actiontype
  • mathml.elements.maction.actiontype.toggle
  • mathml.elements.maction.selection

• mfenced - Entire element is deprecated

  • mathml.elements.mfenced

• mfrac:

  • mathml.elements.mfrac.denomalign - Deprecated attribute
  • mathml.elements.mfrac.numalign - Deprecated attribute
  • mathml.elements.mfrac.linethickness.named_spaces - Deprecated attribute value
  • mathml.elements.mfrac.linethickness.nonzero_unitless_values - Deprecated attribute value
  • mathml.elements.mfrac.linethickness.thin_medium_thick - Deprecated attribute value
  • mathml.elements.mfrac.numalign - Deprecated attribute

• mmultiscripts

  • mathml.elements.mmultiscripts.subscriptshift - Deprecated attribute
  • mathml.elements.mmultiscripts.superscriptshift - Deprecated attribute

• mo

  • mathml.elements.mo.named_spaces - Deprecated attribute value
  • mathml.elements.mo.nonzero_unitless_values - Deprecated attribute value

• mpadded

  • mathml.elements.mpadded.named_spaces - Deprecated attribute value
  • mathml.elements.mpadded.nonzero_unitless_values - Deprecated attribute value
  • mathml.elements.mpadded.pseudo_units - Deprecated attribute value
  • mathml.elements.mpadded.scale_factor - Deprecated attribute value

• mspace

  • mathml.elements.mspace.named_spaces - Deprecated attribute value

• mstyle - Entire element is deprecated?

  • mathml.elements.mstyle.background
  • mathml.elements.mstyle.color
  • mathml.elements.mstyle.fontsize
  • mathml.elements.mstyle.fontstyle
  • mathml.elements.mstyle.fontweight

• msub

  • mathml.elements.msub.subscriptshift - Deprecated attribute

• msubsup

  • mathml.elements.msubsup.subscriptshift - Deprecated attribute
  • mathml.elements.msubsup.superscriptshift - Deprecated attribute

• msup

  • mathml.elements.msup.superscriptshift - Deprecated attribute

• mtable

  • mathml.elements.mtable.width.named_spaces - Deprecated attribute value

• semantics

  • mathml.elements.semantics.advanced_visible_child_selection - ???

• Global attributes - Deprecated attributes and attribute values

  • mathml.global_attributes.mathbackground
  • mathml.global_attributes.mathcolor
  • mathml.global_attributes.mathsize
  • mathml.global_attributes.mathsize.named_spaces
  • mathml.global_attributes.mathsize.nonzero_unitless_values
  • mathml.global_attributes.mathsize.small_normal_big